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api changes and render/ghost functions
Original commit message from CVS: api changes and render/ghost functions
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parent
ec9444bae9
commit
e22f481f62
3 changed files with 74 additions and 16 deletions
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@ -1,4 +1,4 @@
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librarydir = $(prefix)/lib/gst
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librarydir = $(prefix)/lib
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library_LTLIBRARIES = libgstgconf.la
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@ -19,6 +19,44 @@ gst_gconf_get_client (void)
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return _gst_gconf_client;
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}
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/* go through a bin, finding the one pad that is unconnected in the given
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* * direction, and return that pad */
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GstPad *
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gst_bin_find_unconnected_pad (GstBin *bin, GstPadDirection direction)
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{
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GstPad *pad = NULL;
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GList *elements = NULL;
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GList *pads = NULL;
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GstElement *element = NULL;
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g_print ("DEBUG: find_unconnected start\n");
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elements = (GList *) gst_bin_get_list (bin);
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/* traverse all elements looking for unconnected pads */
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while (elements && pad == NULL)
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{
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element = GST_ELEMENT (elements->data);
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g_print ("DEBUG: looking in element %s\n", gst_element_get_name (element));
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pads = gst_element_get_pad_list (element);
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while (pads)
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{
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/* check if the direction matches */
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if (GST_PAD_DIRECTION (GST_PAD (pads->data)) == direction)
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{
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if (GST_PAD_PEER (GST_PAD (pads->data)) == NULL)
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{
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/* found it ! */
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g_print ("DEBUG: found an unconnected pad !\n");
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pad = GST_PAD (pads->data);
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}
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}
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if (pad) break; /* found one already */
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pads = g_list_next (pads);
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}
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elements = g_list_next (elements);
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}
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g_print ("DEBUG: find_unconnected stop\n");
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return pad;
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}
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/* external functions */
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@ -47,27 +85,47 @@ gst_gconf_set_string (const gchar *key, const gchar *value)
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gconf_client_set_string (gst_gconf_get_client (), key, value, NULL);
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}
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gboolean
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gst_gconf_render_bin (const gchar *key, GstElement **element)
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/* this function renders the given description to a bin,
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* and ghosts at most one unconnected src pad and one unconnected sink pad */
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GstElement *
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gst_gconf_render_bin_from_description (const gchar *description)
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{
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GstElement *bin;
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gchar *pipeline;
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GstElement *bin = NULL;
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GstPad *pad = NULL;
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GError *error = NULL;
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gchar *value = NULL;
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value = gst_gconf_get_string (key);
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pipeline = g_strdup_printf ("bin.( %s )", value);
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bin = GST_ELEMENT (gst_parse_launch (pipeline, &error));
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/* parse the pipeline */
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bin = GST_ELEMENT (gst_parse_launch (description, &error));
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if (error)
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{
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g_print ("DEBUG: gstgconf: error parsing pipeline %s\n%s\n",
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pipeline, error->message);
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description, error->message);
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g_error_free (error);
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return FALSE;
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return NULL;
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}
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*element = bin;
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return TRUE;
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/* find pads and ghost them if necessary */
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if ((pad = gst_bin_find_unconnected_pad (GST_BIN (bin), GST_PAD_SRC)))
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gst_element_add_ghost_pad (bin, pad, "src");
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if ((pad = gst_bin_find_unconnected_pad (GST_BIN (bin), GST_PAD_SINK)))
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gst_element_add_ghost_pad (bin, pad, "sink");
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return bin;
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}
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/* this function reads the gconf key, parses the pipeline bit to a bin,
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* and ghosts at most one unconnected src pad and one unconnected sink pad */
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GstElement *
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gst_gconf_render_bin_from_key (const gchar *key)
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{
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GstElement *bin;
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gchar *description;
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gchar *value = NULL;
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value = gst_gconf_get_string (key);
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description = g_strdup_printf ("bin.( %s )", value);
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bin = gst_gconf_render_bin_from_description (description);
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g_free (description);
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return bin;
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}
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/*
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@ -12,8 +12,8 @@ gchar * gst_gconf_get_string (const gchar *key);
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void gst_gconf_set_string (const gchar *key,
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const gchar *value);
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gboolean gst_gconf_render_bin (const gchar *key,
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GstElement **element);
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GstElement * gst_gconf_render_bin_from_key (const gchar *key);
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GstElement * gst_gconf_render_bin_from_description (const gchar *description);
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/*
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guint gst_gconf_notify_add (const gchar *key,
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